Every airplane in the world uses a Pitot tube which is ram air to move a gauge. You are using aerodynamic concepts for compressibility in front of an airfoil. Wrong use of application, but hey what do I know? I have only worked on everything from a 747 to an F-15 to a UH-1 to a super cub.....
Why are you so hung up on 230 mph? The air molecules don't know how fast the hood scoop is going. It isn't like they look at a car and say "it is only going 210 mph so we're not jumping in".
The pressure in a hood scoop will increase with the square of the velocity starting from zero. It isn't a light switch that turns on at 230 mph. There will be positive pressure (greater than 14.7 psi) at any speed above zero. The equation was posted back on page one of this thread.
Well it's just the fluid dynamics theory. That's all. Show me the contrary proof that ram air can give positive pressure. Again, great conversation (some notable exceptions however).
Last edited by astjp2; 04/07/1610:34 PM.
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